Hello JW,
Welcome to ECF and congrats on giving up smoking.
To replace your EGO, a very common upgrade is the iTaste
vv3 or
MVP2. Both provide 11W power which will increase your vapor and flavor production. They are relatively simple
devices that still offer many features.
If you want even more power a
VAMO5 is pretty good option. It goes up to 15W, uses 18650 batteries, and can be had pretty cheap from
fasttech. The downside with this type of device is that you will need to buy batteries and a charger for it, which makes them a bit more expensive and complicated than the MVP2.
The biggest part of vapor production will your topper though. I would generally recommend the Aspire Nautilus but good luck finding one

After that, the Kanger
Aerotank would be a good choice.